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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Selective excitation of vibrational modes and probe for asymmetric intramolecular energy redistribution
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Selective excitation of vibrational modes and probe for asymmetric intramolecular energy redistribution

机译：用于不对称分子内能量再分配的振动模式和探头的选择性激发

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Femtosecond time- and frequency-resolved coherent anti-Stokes Raman scattering spectroscopy was performed on liquid nitrobenzene (NB) to explore intramolecular vibrational energy redistribution in the electronic ground state. While high-frequency C-H stretching vibrational modes (nu(CH) similar to 3080 cm(-1)) were selectively excited, vibrational energy redistribution to the nitro group and phenyl ring breathing modes (nu(s)(NO2) similar to 1335 cm(-1), v(NO2)(as) similar to 1514 cm(-1) and nu(CC) similar to 1584 cm(-1)) was described. While lower frequency modes of the nitro group and phenyl ring breathing were selectively excited, vibrational energy redistribution to C-H stretching modes with higher efficiency was detected. There is counter-intuitive vibrational energy flow in NB. Vibrational energy redistribution was discussed in the view of coherent population transfer between parent modes. Coherent coupling of these relevant modes and the selectivity of vibrational energy redistribution were further analyzed from the viewpoint of vibrational symmetry.
机译：在液氮（Nb）上进行了飞秒的时间和频率分辨的相干抗Stokes拉曼散射光谱，以探讨电子地面状态的分子内振动能量再分布。虽然高频CH拉伸振动模式（类似于3080cm（-1）的Nu（CH））被选择性地兴奋，振动能量再分布到硝基和苯环呼吸模式（NU（NO2）类似于1335厘米（-1），类似于1514cm（-1）的V（NO2）（AS）和类似于1584cm（-1））的NU（CC））。虽然硝基组和苯环呼吸的较低频率模式是选择性激发的，但是检测到具有更高效率的C-H拉伸模式的振动能量再分配。 Nb有反向直观的振动能量流动。在父片模式之间的相干群体转移方面讨论了振动能量再分配。从振动对称的观点出发，进一步分析了这些相关模式的相干耦合和振动能量再分布的选择性。

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